# Volatility
# Copyright (C) 2007-2013 Volatility Foundation
#
# This file is part of Volatility.
#
# Volatility is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# Volatility is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Volatility.  If not, see <http://www.gnu.org/licenses/>.
#

"""
@author:       Andrew Case
@license:      GNU General Public License 2.0
@contact:      atcuno@gmail.com
@organization: 
"""

import volatility.obj as obj
import volatility.plugins.mac.common as common
from volatility.renderers import TreeGrid


class mac_list_zones(common.AbstractMacCommand):
    """ Prints active zones """

    def calculate(self):
        common.set_plugin_members(self)

        first_zone_addr = self.addr_space.profile.get_symbol("_first_zone")

        zone_ptr = obj.Object("Pointer", offset = first_zone_addr, vm = self.addr_space)
        zone = zone_ptr.dereference_as("zone")

        while zone:
            yield zone
            zone = zone.next_zone       
 
    def unified_output(self, data):
        return TreeGrid([("Name", str),
                         ("Active Count", str),
                         ("Free Count", str),
                         ("Element Size", str)
                        ], self.generator(data))

    def generator(self, data):
        for zone in data:
            name = zone.zone_name.dereference().replace(" ", ".")
    
            # sum_count was introduced in 10.8.x
            # do not want to overlay as 0 b/c we mess up subtraction
            if hasattr(zone, "sum_count"):
                sum_count = zone.sum_count - zone.count
            else:
                sum_count = "N/A"

            yield(0, [
                str(name),
                str(zone.count),
                str(sum_count),
                str(zone.elem_size),
            ])

